关于高铁地震波场虚拟道集生成的理论分析

Theoretical analysis of generating virtual seismic gatherings through high-speed rail-induced subsurface seismic wave fields

中国约80%的高铁运行于高架桥上,高铁振动通过桥墩传入地面.本文对运行于等间隔桥墩的高架桥上高铁振动产生的地下地震波场形态进行了理论分析,根据其在特定方向形成相干相位稳相点区域的特征,设计了一种基于多个不同速度高铁列车振动记录叠加,分离单桥墩激发虚拟地震波场的方法,并对单层与多层介质的情形进行了理论验证.

About 80% of China′s high-speed trains operate on viaducts,with vibrations transmitted to the ground through evenly spaced bridge piers.This paper presents a theoretical analysis of the subsurface seismic wave field generated by high-speed train vibrations on viaducts with evenly spaced piers.Based on the feature of coherent phase-stable regions in specific directions,a method is devised to generate virtual seismic wave fields by overlaying vibration recordings from multiple high-speed trains with varying velocities and isolating the excitation from individual bridge piers.Theoretical validation of this method is conducted for scenarios involving single and multiple-layered media.